Keyhold plug and clamp



Feb. 12, 1929.

F. HEBERLEIN Y KEYHOLE PLUG AND CLAMP Filed Aug. l1, 1927 Wouw@ lll Patented Feb. l2, 192.9u

illil'llhl) STATES FREDERICK HEBERLEIN, 0F CLEVELAD, OHO.

KEYHOLE FLUG AND CLAMIS.

Application led August 11, 1927. Serial No. 212,281.

'lhe present invention provides a device whereby the look of a door is rendered thief proof after it has once been locked. The advances made in the art of skeleton key making and other forms of devices used in picking locks have made it almost impossible to obtain a lock that cannot be picked and its effectiveness thereby destroyed.

This invention provides a simple device that is adapted to be applied to the keyhole on one side of a door, thereby preventing the unlocking oil' the door from the opposite side. llfhen availed of, a keyhole plug made along the lines of my invention will cooperate with the lock in affording a locking combination, the effectiveness of which may be overcome only by a complete destruction thereof.

ln attaining these ends a plug or closure is provided for the keyhole of the lock, with which the invention is intended to be used, together with certain instrumentalities that retain the plug in the hole as well as facilitate the application and removal of the plug.

, This invention includes certain novel constructions embodied in the plug, whereby it is in no way subject to being removed or deformed after it has been placed in the keyhole. This is accomplished by forming the end of the plug that enters the hole in a diamond point and then case hardening it. Such a plug will be found to be impervious to any illicit operations which may be made thereon, aiming at its removal from the lock, to allow for the unfastening thereof.

A more particular object of this invention is to provide means for holding the plug in a keyhole, together with additional means that may be employed, as desired, in rendering the functioning of the iirst named means a positive fact. In carrying out this idea, a plate designed to afford a groove or trough, adapted to receive a portion of the plug, is provided. This plate is fastened to either the door or door-frame, as found suitable. It will be noted that when a portion of the plug is resting in the groove or trough, the keeper means, in the form of a Ushaped plate, is provided, which positively holds it therein. y y

With these and other objects in view, as will in part be hereinafter stated, and in part become apparent, the invention comprises certainv novel constructions, combinations, and arrangements of parts as will be subsequently specified and claimed.

For a complete understanding of the invention reference may be had to the following descriptions and accompanying drawings in which:

Figure l is a front elevation showing my keyhole plug and clamp applied to a door, the illustration of the door and its frame being fragmentary and broken away.

Figure 2 is a cross sectional View taken on the line 52-2 of Figure l, looking in the direction indicated by the arrows.

Figure 3 is a detailed perspective of the plug itself, showing more particularly the diinnond point and angular formation thereor.

Figure i .is a detailed perspective of the keeper. y

Figure 5 is a view showing the plate attached to the door frame rather than the door.

Figure il is a front elevation showing a slight modiiication inrwhich the keeper is notched for holding it in position when not lll USG..

l/Vhile the preferred form of the invention herein set forth it is to be understood that l am not to be limited to the exact construction illustrated and described, because various modifications of these details may be provided in putting the invention into practice within the purview of the appended claims.

A keyhole plug and clamp made in accordance with this invention is adapted to be applied to either side of a door making use of any of the well known locks having keyholes.

ll o particular shape or size of the keyhole `is L pertinent so far as thek application of this invention isy concerned as the plug included in the device may be Ina-de in any size found desirable. A keyhole plug and clamp made along the lines of my invention comprise the following parts: a plug or closure member, a retaining plate, and keeper. Inlligure 1 these parts are shown as they areapplied to a door in the manner in which they are intended to be used.

ln Figure l a door A and a door-frame B. in which it is mounted, are both shown in part, as a complete illustration thereof is not deemed necessary for an understanding` ot' this invention. The door A has a keyhole l that receives a key when the lock is operated. This keyhole is surrounded by a key plate 2.` All of the structure just'described is a part of the construction ordinarily embodied in.

the lock of a door.

leo

A plug or closurerniember 3 is provided that is designe-d to close or stop up the keyhole rl, therebypreventing the insertion of a key, which is necessary for the operation of the lock. It will be noted that thisl plug member is appliedand removed froniv one side'of therdoor'so as to lock the door against Vopening from the opposite side. rlhis plug member 3 comprises the-plug portionl, which lio" l formed in the'clainp v`Bythe loosening or enters the keyhole When thefdevice is in use, and the portion 6 bent tosubs'tantially'a right angular relationship With the portion 4. rlhe luv' ortion 4 has a diamond ioint 5y there-4 on, as clearly shown in Figure 3, and is case hardened.` 'The lparticular construction of. this plug is a very important 'feature of this invention, vas the case hardened diamond Vpointy makes it practically impossible for the plug` to'be deformed or removed While in the keyhole. Obviously the device would still function if this diamond 4point construction VVwere eliminated', but it is, however, the preferredv form of my invention.

n order to' prevent the removal of the plugV from-,the keyhole, a retaining plate 'luis' provided'. In this instance I have shown the plate applied to the door. It is to he un` derstood, however, that it may also beapplied Y @to the door frame, as illustrate-d in Fig. 5.V v`l/Vlien applied' in this manner the portions 5 of the plug member 3 functions as a bolt in adding tothe locking retained in the keyhole; t is notable that l `have shown theplate 7 fastened to the door,

preferablyby'screvv fastening means 9, al# n though1 anyequivalent thereof foundV suitable could just as well be employed.` Projecting from the upperfend ofthe plate 7 is a screw 10A that is designedforla purpose to be hereinafter described.v

` After the door has been locked the portion of the plug Sis inserted in the keyhole, after which it turned therein so that the portion 6 rests inthe groove or trough 8. Attention is called tothe fact that any removal ofthe plug'froin-the opposite side ofthe door is noviV prevented. To insure retention of the portion 6 in the trough a keeper member has been designed topositively hold tl'ierportion 6 of the plug therein.

A Y keeper ll, of substantially itl-,shaped formation, isheld'in clamping position by a thumb or Wing nut 13, whiclrthreads onthe screw l0, projecting through a channel l2 may be ai Y i el effectiveness of the lock. The plate 7 is formed so as to provide a Vgroove or trough 8 that is adapted to reeV ceive the portion 6 of the plug under certian conditions, namely, Whenthe plug is to be tightening of the Wing nut 13 the Apositionl of the keeper member 11 is adj ust-ed, as desired.

lt is to be clearly understood that the provision of the keeper ineniber 11 is to be op-V `i ed of. instead of providing a" cated-by the dotted lines lin Figure 6, by enraging iv lfvlhen the` keeper is to he placed in its inoperative position it is swung over so thatk the notch lug l5, inV which position it is held until its use is desired.

ing thus described my invention what ters latent of the "United` States,'is: Y l. The combination Witha door and lock vhai/"ing a keyhole, of an angularly shaped plug, a port en 'of ywhich is inserted inthe keyhole,a plate hai/ing atroughfastened to the door, said -troueh receiving Va portion'of the plug, and a keeper nieniberfor retaining a'fport'ien of the plug inthe Ysaid trough.

2. VA for keyholesfcomprising an an Ygulai'ly 'snaped inetal member having a 'casehardened diamond point, and means. functioning throughl tli`"e;aiigular portion vof the ineinberto retain the point in av key! 3. il. device fo1 closing keyholes comprisd ing'a plug,a porti-onor' which isvadapted to inserted in'. a keyliole,rneaiis adjustably engaging with `the other portionV o ftlie. plug ii lug istruck from the plate 7.

inns new, and desire to secure by Letfor retaining'it in the hole, a keeper member for positively maintaining the engagement between the Vvplug and theine'ans retaining it in the keyhole. Y o' Y 4. A deviee for closing keyholescoinpris'- ing a'p'u'g, a portionofvvhich is'adapte'd to be inseiteu in a keyhole, means engaging Ywith, the other portion of 'the` plug for re taining it in tl'ieiiole, a keeper niember'for positively maintaining the engagenientpbe tween the plug'and tlieineansfretaiiiing it i in the'keyliole, and means for holding the keeper member in adjustedposition While iii-- operative. i'

ln'testiinony whereof l adir mysignature.v

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